[Python-ideas] [Python-Dev] minmax() function returning (minimum, maximum) tuple of a sequence

Tal Einat taleinat at gmail.com
Fri Oct 15 05:05:43 CEST 2010

On Fri, Oct 15, 2010 at 4:09 AM, Ron Adam wrote:
> On 10/13/2010 07:13 PM, Tal Einat wrote:
>> On Thu, Oct 14, 2010 at 1:14 AM, Nick Coghlan wrote:
>>> Why use feed() rather than the existing generator send() API?
>>> def runningmax(default_max=None):
>>>    max_value = default_max
>>>    while 1:
>>>        value = max(yield max_value)
>>>        if max_value is None or value>  max_value:
>>>            max_value = value
>> I tried using generators for this and it came out very clumsy. For one
>> thing, using generators for this requires first calling next() once to
>> run the generator up to the first yield, which makes the user-facing
>> API very confusing. Generators also have to yield a value at every
>> iteration, which is unnecessary here. Finally, the feedMultiple
>> optimization is impossible with a generator-based implementation.
> Something I noticed about the min and max functions is that they treat
> values and iterable slightly different.

Sorry, my bad. The max in "value = max(yield max_value)" was an error,
it should have been removed.

As Guido mentioned, there is never a reason to do max(value) where
value is not an iterable.

- Tal

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